import 'dart:io';

void main() {

List<Map<String, double>> incomeList = [];
List<Map<String, double>> expenseList = [];

bool running = true;

while (running) {

print('\n---- Budget Management ----');
print('1. Add Income');
print('2. Add Expense');
print('3. View Summary');
print('4. Exit');

stdout.write('Choose option: ');
int choice = int.parse(stdin.readLineSync()!);

if (choice == 1) {

stdout.write('Enter income description: ');
String desc = stdin.readLineSync()!;

stdout.write('Enter income amount: ');
double amount = double.parse(stdin.readLineSync()!);

if (amount > 0) {
incomeList.add({desc: amount});
print('Income added successfully');
} else {
print('Invalid amount');
}

}

else if (choice == 2) {

stdout.write('Enter expense description: ');
String desc = stdin.readLineSync()!;

stdout.write('Enter expense amount: ');
double amount = double.parse(stdin.readLineSync()!);

if (amount > 0) {
expenseList.add({desc: amount});
print('Expense added successfully');
} else {
print('Invalid amount');
}

}

else if (choice == 3) {

double totalIncome = 0;
double totalExpense = 0;

for (var item in incomeList) {
totalIncome += item.values.first;
}

for (var item in expenseList) {
totalExpense += item.values.first;
}

double net = totalIncome - totalExpense;

print('\n---- Summary ----');
print('Total Income: \$${totalIncome}');
print('Total Expenses: \$${totalExpense}');

if (net >= 0) {
print('Net Profit: \$${net}');
} else {
print('Net Loss: \$${net.abs()}');
}

// Optional Tax
double tax = net > 0 ? net * 0.15 : 0;

if (tax > 0) {
 print('Tax to pay (15%): \$${tax}');
}

}

 else if (choice == 4) {
  print('Exiting program...');
  running = false;
}

 else {
   print('Invalid option');
}
}
}